[Shybox] Why won't my Girlfriend NTR me?

A short‑haired woman in a tank top and shorts confidently dismisses her boyfriend, who is left sobbing outside a McDonald's. Hours later, the boyfriend discovers a lewd NTR phone game showing his girlfriend in explicit sexual acts with another man, and he becomes obsessed, edging for hours. The story ends with a thank‑you page that reveals the game’s name and displays a QR code, while the characters’ strained relationship hangs in the balance.